WLAN17202ER User's Manual
7
RTD Embedded Technologies, Inc.
Connectors J3 and J4 – WLAN Antenna Connectors
WLAN17202ER is capable of hardware antenna diversity if external antennas are connected to both of
the on-board Main and Auxiliary antenna connectors. These connectors are of the MCX/OSX type.
External WLAN antennas are available as part of the SK-WLAN17202ER starter kit.
Note:
The WLAN17202ER will automatically use whichever antenna has the greatest signal strength. If
only one antenna is attached, that one will always be used.
PCI Configuration Options
To install the WLAN17202ER into the stack, the PCI Slot Number must be configured correctly. This is
done by the rotary switch SW1. There are four possible PCI Slot Numbers (0 – 3). Each PCI device
(PC/104
-Plus
or PCI-104) must a use a different slot number. The slot number is related to the position of
the board in the stack. Slot 0 represents the PCI device closest to the CPU. Slot 3 represents the PCI
devices farthest away from the CPU.
Note:
In a PC/104-
Plus
or PCI-104 system, all PCI devices should be located on one side of the CPU
board (above or below the add-on cards). The CPU should not be located between two PCI
devices.
Rotary Switch SW1 – PCI Slot Selector
The WLAN17202ER has an eight position rotary switch. The PCI Slot Number can be configured as
follows:
Switch Position
PCI Slot Number
0
Slot 0 (closest to CPU)
1 Slot
1
2 Slot
2
3 Slot
3
4
Undefined
5
Undefined
6
Undefined
7
Undefined
Jumpers JP1 and JP2 – Bus Master Control
When the PC/104
-Plus
Specification was first introduced, it only allowed for three PCI add-on cards to be
bus masters. Version 2.0 of the PC/104
-Plus
specification was released in November 2003. This version
of the specification (which the WLAN17202ER is designed for) adds support for all 4 PCI slots to be bus
masters.
For compatibility with CPUs designed for the older PC/104
-Plus
Specification, the WLAN17202ER offers
configuration jumpers JP1 and JP2. If the jumpers are set to position 1-2 (the default), the board
supports bus mastering in all 4 PCI slots. If the jumpers are set at position 2-3, the board will work in a 3
bus master configuration.
Note:
Both jumpers must be set with the same position for the WLAN17202ER to operate correctly.
